Bug 2477217 (CVE-2026-42579)

Summary:	CVE-2026-42579 netty: Netty: High integrity impact due to improper DNS domain name constraint enforcement
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aazores, ant, anujha, aschwart, asoldano, aszczucz, avibelli, bbaranow, bbrownin, bgeorges, bmaxwell, boliveir, bstansbe, ccranfor, cescoffi, chfoley, cmah, dandread, dhanak, dkreling, dlofthou, drichtar, drosa, dsimansk, eaguilar, ebaron, ewittman, fmariani, fmongiar, gmalinko, gsmet, gtanzill, ibek, istudens, ivassile, iweiss, janstey, jbuscemi, jkoehler, jmartisk, jnethert, jolong, jpechane, jrokos, jwon, kaycoth, kingland, kverlaen, lphiri, lthon, manderse, mcarlett, mnovotny, mosmerov, mposolda, mstipich, msvehla, nipatil, nwallace, olubyans, pantinor, pberan, pbizzarr, pdelbell, pesilva, pgallagh, pjindal, pmackay, probinso, rexwhite, rgodfrey, rguimara, rkubis, rmartinc, rruss, rstancel, rstepani, rsvoboda, sausingh, sbiarozk, sdawley, smaestri, ssilvert, sthirugn, sthorger, swoodman, tcunning, thjenkin, tqvarnst, vdosoudi, vmuzikar, yfang
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
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Doc Text:	A flaw was found in Netty. Netty's DNS (Domain Name System) codec does not properly enforce domain name constraints as defined in RFC 1035 during both encoding and decoding processes. This vulnerability allows a remote attacker to exploit the decoder using malicious DNS responses or exploit the encoder through user-influenced hostnames, leading to a high integrity impact on the affected system.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-05-13 19:01:47 UTC

Netty is an asynchronous, event-driven network application framework. Prior to 4.2.13.Final and 4.1.133.Final, Netty's DNS codec does not enforce RFC 1035 domain name constraints during either encoding or decoding. This creates a bidirectional attack surface: malicious DNS responses can exploit the decoder, and user-influenced hostnames can exploit the encoder. This vulnerability is fixed in 4.2.13.Final and 4.1.133.Final.

Comment 3 errata-xmlrpc 2026-06-22 17:15:46 UTC

This issue has been addressed in the following products:

  Cryostat 4 on RHEL 9

Via RHSA-2026:28010 https://access.redhat.com/errata/RHSA-2026:28010

Comment 4 errata-xmlrpc 2026-07-09 15:30:57 UTC

This issue has been addressed in the following products:

  Red Hat build of Apache Camel 4.18.1.P1 for Spring Boot 3.5.16

Via RHSA-2026:37390 https://access.redhat.com/errata/RHSA-2026:37390